﻿#region Copyright
// Copyright (c) 2011-2012 RaisingForce Team (Alikin Sergey)
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.Contracts;

namespace RaisingForce.Raise.Language.RStates.Internal
{
    sealed internal class RStateMutableContextState :
        IRStateMutableContextState
    {
        #region Constructors

        internal RStateMutableContextState(IRStateContextState sourceContextState)
        {
            Contract.Requires(sourceContextState != null);
            this.counterState = sourceContextState.CounterState;
            this.counterValue = sourceContextState.CounterValue;
            this.counterInitializedState = sourceContextState.CounterInitializedState;
            this.currentChain = sourceContextState.CurrentChain;
            this.previousChain = sourceContextState.PreviousChain;
            this.objectPosition = sourceContextState.ObjectPosition;
        }

        internal RStateMutableContextState()
        {
            this.counterState = CounterState.Default;
            this.counterValue = CounterValue.Default;
            this.counterInitializedState = CounterInitializedState.Default;
            this.currentChain = CurrentChain.Default;
            this.previousChain = PreviousChain.Default;
            this.objectPosition = ObjectPosition.Default;
        }

        #endregion

        #region Private Declarations

        private CounterState counterState;

        private CounterValue counterValue;

        private CounterInitializedState counterInitializedState;

        private CurrentChain currentChain;

        private PreviousChain previousChain;

        private ObjectPosition objectPosition;

        [ContractInvariantMethod]
        private void ObjectInvariant()
        {
            Contract.Invariant(this.counterState != null);
            Contract.Invariant(this.counterValue != null);
            Contract.Invariant(this.counterInitializedState != null);
            Contract.Invariant(this.currentChain != null);
            Contract.Invariant(this.previousChain != null);
            Contract.Invariant(this.objectPosition != null);
        }

        private void SetProperty<T>(ref T value, T newValue, string propertyName)
            where T : RState
        {
            Contract.Requires(value != null);
            Contract.Requires(newValue != null);
            Contract.Requires(propertyName != null);
            if (!EqualityComparer<T>.Default.Equals(value, newValue))
            {
                T previousValue = value;
                value = newValue;
                PropertyChangedEventHandler handler = this.PropertyChanged;
                if (handler != null)
                {
                    RStateContextEventArgs e =
                        new RStateContextEventArgs(
                            previousValue,
                            newValue,
                            propertyName);
                    handler(this, e);
                }
            }
        }

        #endregion

        #region Base Overrides

        public override bool Equals(object obj)
        {
            return obj is IRStateContextState ?
                this.Equals((IRStateContextState)obj) :
                false;
        }

        public override int GetHashCode()
        {
            return RStateContextStateHelper.GetHashCode(this);
        }

        #endregion

        #region IRStateMutableContextState Members

        public event PropertyChangedEventHandler PropertyChanged;

        public CounterState CounterState
        {
            get
            {
                return this.counterState;
            }
            set
            {

                this.SetProperty(ref this.counterState, value, "CounterState");
            }
        }

        public CounterValue CounterValue
        {
            get
            {
                return this.counterValue;
            }
            set
            {
                this.SetProperty(ref this.counterValue, value, "CounterValue");
            }
        }

        public CounterInitializedState CounterInitializedState
        {
            get
            {
                return this.counterInitializedState;
            }
            set
            {
                this.SetProperty(
                    ref this.counterInitializedState,
                    value,
                    "CounterInitializedState");
            }
        }

        public CurrentChain CurrentChain
        {
            get
            {
                return this.currentChain;
            }
            set
            {
                this.SetProperty(ref this.currentChain, value, "CurrentChain");
            }
        }

        public PreviousChain PreviousChain
        {
            get
            {
                return this.previousChain;
            }
            set
            {
                this.SetProperty(ref this.previousChain, value, "PreviousChain");
            }
        }

        public ObjectPosition ObjectPosition
        {
            get
            {
                return this.objectPosition;
            }
            set
            {
                this.SetProperty(ref this.objectPosition, value, "ObjectPosition");
            }
        }

        public IRStateContextState AsReadOnly()
        {
            return new RStateReadOnlyContextState(this);
        }

        #endregion

        #region IEquatable<IRStateContextState> Members

        [Pure]
        public bool Equals(IRStateContextState other)
        {
            return RStateContextStateHelper.Equals(this, other);
        }

        #endregion
    }
}
